Pump



Feb. 2, 1937. TENNANT 7 2,069,338

PUMP

Filed'May 14, 1954 Jbseph A. Tenn an t INVENTOR.

B? .LRcMMJi- J4 TTORNE Y.

Patented Feb. 2, 1937 UNITED STATES PATENT QFFlCE PUMP Delaware Application May 14, 1934, Serial No. 725,568

8 Claims.

This invention relates generally to pumps.

It will be found particularly useful in pumps designed for pumping abrasive and corrosive fluid of the general type disclosed by Letters Patent of the United States to Stephens No. 1,848,441 of March 8, 1932. A conventional pump of this type adapted for use as a mud or slush pump in deep well drilling includes a barrel; inlet and outlet valves therefor; a hollow expansible member within the barrel; and a reciprocable piston to actuate pumping fluid confined within theexpansible member to'cause expansion'and contraction thereof whereby pumped fluid is drawn into and forced out of said barrel.

5 In pumps of other types the pumped fluid is in'contact with the piston and rod and carries away the heat generated by the reciprocation of the piston and rod through conventional packings. In the type of pump to which this invention 2 relates, however, the piston and rod are sealed off from the fluid being pumped and the heat so generated is therefore transferred to the pumping fluid within the expansible member. These expansible members are usually made of rubber,

. which is a very good heat insulator, and the pumping fluid within the expansible member is in contact with very little metal. .Under certain conditions, such as when the packings are inadvertently made too tight, the heat is not dissipated as rapidly as it is generated. And so, under such conditions, the pumping fluid in the expansible member will reach a, very high temperature whereby the expansible member will be injured; and when the pressure on the pumping fluid is reduced on the suction stroke of the piston, the

pumping fluid will boil so that the pumping member will remain expanded, which renders the pump inoperative. v

This invention has for its general object the provision of new and improved means to prevent.

heating of the pumping fluid to an objectionably high temperature by cooling the packing to remove the heat where it is generated and before it enters the pumping fluid in the expansible member.

A specific object of the invention is to provide means to so cool the packing with the pumped fluid as a coolant. Q

Another specific object is to so cool the packing by circulating therethru a coolant from an external source independently of the pump.

Other objects will hereinafter appear.

The preferred embodiment of the invention is illustrated by the accompanying drawing which 5.5 is a sectional elevation of one of the barrels of the pump equipped with the packing cooling means.

As the operation of this pump is'clearly set forth in the said patent to Stephens No. 1,848,441, it will be but briefly referred to here as follows: In the drawing the barrel is indicated at I, and the inlet and outlet means at 2 and 3, the latter including valves not shown. Within the barrel I is a hollow expansible member 4 which may comprise a rubber sleeve having an external annular flange 5 secured to one end wall of the barrel I by the ring 6; and an external annular flange I secured to the other end wall of the barrel by a ring 8. The numeral 9 indicates the piston which is reciprocated by means not shown to actuate the pumping fluid Within the expansible member 4 to draw the pumped fluid into the barrel I through the inlet means 2, and to expel it from the barrel I through the outlet means 3. When the piston 9 is at the end of its suction stroke as shown, the shape of the expansible member 4 is substantially cylindrical, and the barrel I is filled with pumped fluid. When the piston 9 movesto the right on its discharge stroke it displaces the pumping fluid in said expansible member and causes said expansible member to expand. During such expan- 2 sion the inlet valve (not shown) of the means 2 remains closed and the outlet valve (not shown) of the means 3 opens to permit the pumped fluid to be expelled from the barrel I through the outlet means 3. Now when the piston moves to the 'left on its suction stroke the expansible member 4 contracts from its expanded shape into its con tracted shape; and as the valve (not shown) of the outlet means 3 then remains closed, and the valve (not shown) of the inlet means 2 opens, a fresh charge of pumped fluid is thereby drawn into the barrel I. It will be obvious that as the piston 9 reciprocates the pumped fluid will be barrel.

The means whereby the ends of the expansible member 4 are sealedto the barrel I may, of course, be varied without departing from the present invention. The construction herein dis- 45 closedfor that purpose will form the subject matter of another application.

Referring now to the new and improved means provided by this invention for the purposes above set forth, it will be noted that the packing I0 is 50 surrounded by a packing cooler II which includes an annular longitudinally elongated passageway I2. The cooler II is secured to the barrel I by suitable bolts not shown, and it in turn holds the ring 8 against the flange l of the expansible alternately drawn into and expelled from the 40 member 4, the packing I0 being held in place by the gland I3 and ring nut I4.

The annular passageway I2 of the cooler is connected by the pipes I5 and I6 to the inlet passageway I'I leading to the inlet means 2, and by the pipes I8 and I9 to the outlet passageway 20 leading from the outlet means 3. The said passageway I2 015 the cooler is also connected by the pipes I8 and 2| and I5 and 22 to an external coolant source of supply, a pump indicated at 23 being disposed in the pipe 2I to cause the coolant to circulate through the cooler passageway I2. The valves 24, 25, 26 and 21 are provided so that the pumped fluid and the coolant from the external source of supply'may, if desired, be alternately supplied to the passageway I2 to keep the packing III cool in a manner which will now be described.

If the valves 24 and 26 are closed and the valves 28 and 21 open, when the piston 9 is reciprocated a portion of the pumped fluid being discharged through the outlet 20 will pass through the pipes I9 and I! and through the annular passageway I2 of the cooler to prevent the excessive generation of heat, and thence through the pipes I5 and I6 into the inlet N.

If the valves 25 and 21 are closed and the valves 24 and 26 open, and the coolant pump 23 operated, the coolant may be forced from the external source of supply through the pipes 2| and I8 into the annular passageway I2 of the cooler to prevent the generation of excessive heat, and thence through pipes I5 and 22 back to the source of coolant supply.

It will be apparent in view of the foregoing that the heat is removed before it enters the pumping fluid in the expansible member 4; that is, it is removed from the packing and piston by which it is generated.

The invention is notlimited to the preferred embodiment herein disclosed. Various changes will occur to those skilled in the art, and may be made within the scope of the following claims.

I claim;

1. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member supported by and sealed in said barrel; pumping fluid in said member; a packing a piston extending through and reciprocable in said packing to actuate said pumping fluid to efiect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means; a cooler surrounding said packing and communicating with said inlet means and outlet means so that a portion of the pumped fluid discharged through said outlet means will pass through said cooler into said inlet means, said cooler being shut oil from fluid communication with said pumping fluid.

2. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member supported by and sealed in said barrel; pumping fluid in said member; a packing; a piston extending through and reciproca ble in said packing to actuate said pumping fluid to effect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means; a cooler surrounding said packing and communicating with said outlet means so that a portion of the pumped fluid discharged through said outlet means will pass through said cooler, said cooler being shut off from fluid communication with said pumping fluid.

3. A pump having a barrel; inlet and outlet means for said barrel; I pumping member supported by and sealed in said barrel; pumping fluid in said member; a packing; a piston extending through and reciprocable in said packing to actuate said pumping fluid to eflfect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means; a packing cooler extending along said packing and communicating with said outlet means so that a portion of the pumped fluid discharged through said outlet means will pass through said cooler, said cooler being shut off from fluid communication with said pumping fluid.

4. A pump having a barrel; a hollow expansible pumping member supported by and sealed in said barrel; pumping fluid in said member; a packing; a piston extending through and reciprocable in said packing to actuate said pumping fluid to efiect the movement of pumped fluid thru said barrel; a packing cooler extending along said packing and being closed against passage of cooling fluid into said pumping fluid; and means to convey to said packing cooler pumped fluid discharged from said barrel.

5. A pump having a barrel, inlet and outlet means for said barrel; a hollow expansible pumping member supported by and sealed in said barrel; pumping fluid in said member; a packing; a piston extending through and reciprocable in said packing to eifect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to discharge it from said barrel through said outlet means; a cooler surrounding said packing and closed against passage of cooling fluid into said pumping fluid; and means to circulate a cooling fluid through said cooler.

into said barrel through said inlet means, and to discharge it from said barrel through said outlet means; a packing cooler extending along said packing and closed against communication with said pumping fluid; and means to circulate a cooling fluid through said cooler, independently of said pump.

'7. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member sealed in said barrel; pumping fluid in said member; a packing; a piston extending through and reciprocable in said packing to actuate said pumping fluid to effect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means; a hollow annulus having a central opening for the reception of the piston and being closed against fluid communication with said pumping fluid, and a counterbore for said packing arranged to seal one end of said pump barrel, said annulus having a peripheral flange ior securement to the barrel to seal the expansible member therein; a packing gland and rin scab ing the packing to the piston and secured to mic annulus; and means connecting the pump outl-r a hollow expansible Y rocable in said packing tofactuate said pumping fluid to eifect the movement of the pumped fluid through said barrel, and means for passinga- I portion of the. pumped fluid about saidlpacking;

said means being closed against fluid communi- 5 cation with said pumping fluid.

' JOSEPH A. 'I'ENNANTi 

